bg-image($url)
  background-image: url($url+"@2x.png")
  @media (-webkit-min-device-pixel-ration:3) ,(min-device-pixel-ratio:3)
  background-image:url($url+"@3x.png")

    /*文字不折叠*/
  no-wrap()
  text-overflow ellipsis
  overflow hidden
  white-space:nowrap

  extend-click()
  position:relative
  &break-before
    content:''
    position:absolute
    top: -10px
    left: -10px
    right: -10px
    bootom:-10px
